[VOL-4290] Voltha go library updates for gRPC migration

Change-Id: I1aa2774beb6b7ed7419bc45aeb53fcae8a8ecda0
diff --git a/vendor/github.com/Shopify/sarama/metadata_request.go b/vendor/github.com/Shopify/sarama/metadata_request.go
index 1b590d3..e835f5a 100644
--- a/vendor/github.com/Shopify/sarama/metadata_request.go
+++ b/vendor/github.com/Shopify/sarama/metadata_request.go
@@ -65,6 +65,10 @@
 	return r.Version
 }
 
+func (r *MetadataRequest) headerVersion() int16 {
+	return 1
+}
+
 func (r *MetadataRequest) requiredVersion() KafkaVersion {
 	switch r.Version {
 	case 1: